Print to TFT display temperature sensor DS18b20 readings, not to serial monitor.

hi,

i have been unable print ds18b20 temerature sensor st7735 tft screen adafruit. 128 x 160. prints fine serial monitor.

i had expected following section calling temperature in celsius able print? appreciated.

code: [select]

{
 sensors.requesttemperatures(); // send command temperatures.
 mytemp0 = (sensors.gettempcbyindex(0));
 mytemp1 = (sensors.gettempcbyindex(1));
{


the following far have been able get.

code: [select]

#include <spi.h>
#include <tft.h>

// libraries ds1820 , onewire
#include <onewire.h>
#include <dallastemperature.h>


//you can use (4 or) 5 pins  
//#define sclk 4
//#define mosi 5
#define cs 6 // pin definition uno
#define dc 7 // pin definition uno
#define rst 8  // pin definition uno
// can connect arduino reset

float mytemp0;
float myhightemp0;
float mylowtemp0 = 50;
float mytemp1;
float myhightemp1;
float mylowtemp1 = 50;

onewire onewire(2); // setup onewire instance communicate devices.
dallastemperature sensors(&onewire);

// create instance of library
tft tftscreen = tft(cs, dc, rst);

void setup()
{
  // put line @ beginning of every sketch uses glcd:
 tftscreen.begin();
 // clear screen black background
 tftscreen.background(0, 0, 255);
   // write static text screen
 // set font color white
 tftscreen.stroke(0,0,0);
 // set font size
 tftscreen.settextsize(2);
 // write text top left corner of screen
 tftscreen.text("temperatures :\n ",10,0);
 // set font color white
 tftscreen.stroke(50,50,50);
 // set font size
 tftscreen.settextsize(1);
 // write text top left corner of screen
 tftscreen.text("fridge temperature :\n ",10,20);
 // write text top left corner of screen
 tftscreen.text("pot 1 temperature :\n ",10,30);
 // ste font size large loop
 tftscreen.settextsize(1);
 
 
sensors.begin();
serial.begin(9600);
}

void loop()
{
 readtemp(); // read temperature.
 serialprint(); // write results serial monitor.
 
}
 
void readtemp() // call sensors.requesttemperatures() issue
               // global temp request devices on bus.
{
 sensors.requesttemperatures(); // send command temperatures.
 mytemp0 = (sensors.gettempcbyindex(0));
 mytemp1 = (sensors.gettempcbyindex(1));
{
 tftscreen.stroke(255,255,255);
 tftscreen.settextsize(1);
 tftscreen.print(mytemp0);
}

 // set high or low temp.
 if (mytemp0 < mylowtemp0)
 {
   mylowtemp0 = mytemp0;
 }
 if (mytemp0 > myhightemp0)
 {
   myhightemp0 = mytemp0;
 }
if (mytemp1 < mylowtemp1)
 {
   mylowtemp1 = mytemp1;
 }
 if (mytemp1 > myhightemp1)
 {
   myhightemp1 = mytemp1;
 }
}

void serialprint()
{
serial.print("current fridge temp 0: ");  
serial.print(mytemp0);
serial.print("c");
serial.print(" lowest temp 0: ");
serial.print(mylowtemp0);
serial.print("c");
serial.print(" highest temp 0: ");
serial.print(myhightemp0);
serial.print("c");
serial.print("\t\t");
serial.print(" current pot plant temp 1: ");  
serial.print(mytemp1);
serial.print("c");
serial.print(" lowest temp 1: ");
serial.print(mylowtemp1);
serial.print("c");
serial.print(" highest temp 1: ");
serial.print(myhightemp1);
serial.println("c");
delay(2500);

}


regards,

wayne

Arduino Forum > Using Arduino > Sensors > Print to TFT display temperature sensor DS18b20 readings, not to serial monitor.

arduino